Don't ever get God mad.

If we disobey God, he can really get nasty.

Leviticus 26:27-35 (MSG)

"and if this-even this! doesn't work, and you still won't listen, still defy me,
I'll have had enough and in hot anger will defy you,
punishing you for your sins seven times over:

famine will be so severe that you'll end up cooking and 
eating your sons in stews and yours daughters in barbeques;
I'll smash your sex-and-religion shrines and
all the paraphernalia that goes with them,
and then stack your corpses and
the idol-corpses in the same piles- I'll abhor you;
I'll turn your cities into rubble;
I'll clean out your sanctuaries;
I'll hold my nose at the "pleasing aroma" of your sacrifices.
I'll turn your land into a lifeless moonscape-
your enemies who come in to take over will be shocked at what they see.

I'll scatter you all over the world and
keep after you with the point of my sword in your backs.
There'll be nothing left in your land,
nothing going on in your cities.
With you gone and dispersed in the countries of your enemies,
the land ,empty of you, will finally get a break and enjoy its Sabbath years.
All the time it's left there empty,
the land will get rest,
the Sabbaths it never got when you lived there."

BUT, if we do confess our sins...

Leviticus 26:44-45 (MSG)

"... I won't reject or abhor or destroy them completely.
I won't break my covenant with them:
I am God, their God.
For their sake I will remember the covenant with their ancestors whom I,
with all the nations watching,
brought them out of Egypt in order to be their God.
I am God."

God's no joke. He's a serious God.